minor GL modifications

Apps/Examples/viewer.cpp

@@ -78,7 +78,9 @@ void Viewer::initGUI()
 
 void Viewer::cb_initGL()
 {
-	Utils::GLSLShader::setCurrentOGLVersion(2) ;
+	Utils::GLSLShader::setCurrentOGLVersion(3) ;
+	CGoGNout << "GL VERSION = "<< glGetString(GL_VERSION)<< CGoGNendl;
+	Utils::GLSLShader::areShadersSupported();
 
 	m_render = new Algo::Render::GL2::MapRender() ;
 	m_topoRender = new Algo::Render::GL2::TopoRenderMap<PFP>() ;

Apps/Examples/volumeExplorer.cpp

@@ -206,6 +206,8 @@ void MyQT::cb_initGL()
 {
 	// choose to use GL version 2
 	Utils::GLSLShader::setCurrentOGLVersion(2);
+	CGoGNout << "GL VERSION = "<< glGetString(GL_VERSION)<< CGoGNendl;
+	Utils::GLSLShader::areShadersSupported();
 
 	// create the renders
 	m_topo_render = new Algo::Render::GL2::Topo3RenderMap<PFP>();

src/Utils/GLSLShader.cpp

@@ -148,10 +148,35 @@ bool GLSLShader::areGeometryShadersSupported()
 
 bool GLSLShader::areShadersSupported()
 {
-	if ( ! glewGetExtension("GL_ARB_vertex_shader")) return false;
-	if ( ! glewGetExtension("GL_ARB_fragment_shader")) return false;
-	if ( ! glewGetExtension("GL_ARB_shader_objects")) return false;
-	if ( ! glewGetExtension("GL_ARB_shading_language_100")) return false;
+	if ( ! glewIsSupported("GL_ARB_vertex_shader"))
+	{
+		CGoGNerr << " vertex shaders not supported!" <<CGoGNendl;
+		return false;
+	}
+
+	if ( ! glewIsSupported("GL_ARB_fragment_shader"))
+	{
+		CGoGNerr << " fragment shaders not supported!" << CGoGNendl;
+		return false;
+	}
+
+	if ( ! glewIsSupported("GL_ARB_geometry_shader4"))
+	{
+		CGoGNerr << " geometry shaders not supported!" << CGoGNendl;
+		return false;
+	}
+
+	if ( ! glewIsSupported("GL_ARB_shader_objects"))
+	{
+		CGoGNerr << " shaders not supported!" << CGoGNendl;
+		return false;
+	}
+
+	if ( ! glewIsSupported("GL_ARB_shading_language_100"))
+	{
+		CGoGNerr << " GLSL no supported!" << CGoGNendl;
+		return false;
+	}
 
 	return true;
 }
@@ -399,7 +424,7 @@ bool GLSLShader::loadGeometryShaderSourceString( const char *geom_shader_source
 		*m_geom_shader_object=0;
 	}
 	/*** create shader object ***/
-	*m_geom_shader_object = glCreateShader(GL_GEOMETRY_SHADER_EXT);
+	*m_geom_shader_object = glCreateShader(GL_GEOMETRY_SHADER);
 
 	if( !*m_geom_shader_object )
 	{

src/Utils/Qt/qtgl.cpp

@@ -193,7 +193,6 @@ glm::vec3& GLWidget::getObjPos()
 
 void GLWidget::initializeGL()
 {
-	std::cout << "GL VERSION = "<< glGetString(GL_VERSION)<< std::endl;
 	glEnable(GL_DEPTH_TEST);
 
 	if (m_cbs)